Electrum or Ledger is as safe as you are sure of all their advantages and disadvantages. A person who keeps 1 BTC in the Electrum wallet on his personal computer (hot wallet), and who at the same time knows where the danger comes from, certainly has greater security than a person who has a hardware wallet and has saved his backup (seed) to e-mail or cloud or something like that.

I kept more than that amount on Electrum before I bought the hardware wallet, although I would never do that again, regardless of all the experience I have - of course, I primarily mean Electrum as a hot wallet.